A Bullet for El Diablo - S6-E10
Factual error: Che makes the voice-print comparison using a polygraph machine - a device used for lie detection, not voice analysis. (00:36:30)
A Bullet for El Diablo - S6-E10
Plot hole: During his investigation, Danno learns that the kidnapped Maria never wears make-up. Yet in every single shot we see of her, Maria is far from cosmetics-free. She's wearing very heavy eye make-up. (00:34:40)
A Bullet for El Diablo - S6-E10
Factual error: Pepe and Carlos are driving a '62 Chevy. When they watch Ramos' motorcade pass, there's an insert shot of a key in the steering column as they start the car. In a 1962 model, the ignition would have been on the dash, not the steering column. (00:13:15)
A Bullet for El Diablo - S6-E10
Continuity mistake: When Rita shoots him, Ramos dies face up on the floor, and she flees without touching him again. When McGarrett finds the body, it's lying face down. (00:20:05)
Answer: He was fired. He never really appreciated his character. He felt Kono was portrayed as a big dumb Hawaiian and that the stereotype was racist. He also felt underutilized. He was fired after a heated argument with the show's publicist regarding his character. It seems there's not much details given regarding the incident or the firing, so it's seems possible he upset the show's producers as well.
Bishop73
No he said something derogatory about one of the Jewish producers that's why he was fired.